2009-04-29_PERMIT FILE - C1982056 (4)

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Western Mining District 18-Left Shaft Site Baseline Soil Investigation APPENDIX 3 ELKHEAD SERIES The Elkhead series consists of very deep, moderately well drained soils that formed in alluvium derived from shale. Elkhead soils are on flood plains. Slopes range from 0 to 3 percent. Mean annual precipitation is about 21 inches and the mean annual temperature is about 38 degrees F. TAXONOMIC CLASS: Fine, smectitic Vertic Haplocryolls TYPICAL PEDON: Elkhead clay loam, on a nearly level slope in hay meadow at an elevation of 6,600 feet. (Colors are for dry soil unless otherwise noted.) When described on July 11, 1984 the soil was moist from 16 to 38 inches and saturated below 38 inches. A--O to 18 inches; very dark grayish brown (10YR 3/2) clay loam, black (10YR 2/1) moist; moderate fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few medium, common fine roots; few very fine tubular pores; thin layers of yellowish brown (IOYR 5/4) loamy fine sand 1/16 to 1 inch thick; neutral (pH 7.2); clear smooth boundary. (16 to 40 inches thick) Bw--18 to 38 inches; dark brown (10YR 3/3) clay, very dark grayish brown (1 OYR 3/2) moist; moderate medium subangular blocky structure; very hard, very firm, moderately sticky and moderately plastic; few fine roots; few fine tubular pores; common faint discontinuous pressure faces on faces of peds; few faint patchy very dark gray (IOYR 3/1) moist, organic stains on faces • of peds in upper part of horizon; neutral (pH 7.2); gradual smooth boundary. (0 to 22 inches thick) Bk1--38 to 50 inches; dark grayish brown (10YR 4/2) clay, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; very hard, very firm, moderately sticky and moderately plastic; few fine roots, few fine tubular pores; common fine seams of calcium carbonate and common fine calcium carbonate threads on faces of peds; slightly effervescent; 20 percent calcium carbonate equivalent; few fine faint brown (IOYR 4/3) moist, masses of iron accumulation; moderately alkaline (pH 8.2); gradual smooth boundary. Bk2--50 to 75 inches; yellowish brown (IOYR 5/4) clay, olive brown (2.5Y 4/4) moist; weak coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine roots; few fine tubular pores; common fine seams of calcium carbonate on faces of peds; strongly effervescent; 20 percent calcium carbonate equivalent; common fine distinct yellowish brown (IOYR 5/4) moist, masses of iron accumulation; moderately alkaline (pH 8.4). (Total thickness of the Bk horizon is 35 to 59 inches thick) TYPE LOCATION: Routt County, Colorado; about 5 miles east of Milner; located about 2,300 feet east and 2,100 feet north of the southwest corner of sec. 9, T. 6 N., R. 85 W.; Cow Creek USGS quad; lat. 40 degrees 29 minutes 28 seconds N. and long. 106 degrees 55 minutes 40 seconds W., NAD 27 Habitat Management, Inc. A3-3 01/15/2009